My code works fine until I get to line 8, and it gives the error shown above. I have no idea how to fix this, and any help is appreciated. Please note this is not the full code.
for _, player in pairs(activecontestants) do
if player and player.Character then
local humanoid = player.Character:FindFirstChild("Humanoid")
if humanoid then
humanoid:UnequipTools()
player.Backpack:ClearAllChildren()
humanoid.Health = 100
gameState.Value = "The winner(s) are " .. activecontestants[player.Name]
local lobbyspawns = workspace:FindFirstChild("LobbySpawns"):GetChildren()
player.Character:MoveTo(lobbyspawns[math.random(1, #lobbyspawns)].Position)
end
end
end
end

2 comments
Only strings can be concatenated. just read the error.
activecontestants[player.Name] might be nil. Try putting "print(activecontestants[player.Name] )" just before the line that errors, to see what you're trying to concat.